Resumo

VELOZA, JULIA; MOLINA, JORGE  e  MEJIA, HUMBERTO. OPEN PIT COAL EXPLOTATION VIABILITY. MARGARITA MINE CASE OF STUDY. Dyna rev.fac.nac.minas [online]. 2006, vol.73, n.150, pp.143-154. ISSN 0012-7353.

This paper provides an analysis of financial viability, planning and design for the new coal open pit exploitation for “La Margarita” mine, with coal-resources estimated on 440.139,7 ton. Dimension, design and economic evaluation was possible by three exploitation methods: (Multiple bench, Open Cast contour, and Terraces). Net Present Values (NVP) were calculated: $C 817,5; $C 518,5 and $C 645,2 respectively for each method (given in million current Colombian pesos $. $C 2380 are equivalent to $US 1) and Rate of Return (ROR) 78,33%; 34,0% and 38,62% respectively for each method. These indicators served as a parameter to choose the multiple bench method, which should be recalculated because it was necessary to work jointly with two pits and making feasible the project. In addition a general environmental evaluation was done, which is vital for the exploitation. Important impacts on the flower, animals, air, water were found, and measures of control, prevention and mitigation were stated. It is expected that this paper can be useful as a technical-economical support for the development of the open pit exploitation in the Margarita Mine

Palavras-chave : Viability; Exploitation; Open pit; Coal; La Margarita mine.

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